Telegraphy and telegraph apparatus.



PATENTED JAN. 30,1906.

v J. BURRY. TELEGRAPHY AND TELEGRAPH APPARATUS.

APPLICATION FILED 0M. 7, 1593.

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No. 811,127. PATENTED JAN. 30, 1906.

J. BURRY. TELEGRAPHY AND TELEGRAPH APPARATUS.

APPLICATION FILED OCT. 7, 1893.

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PATENTED JAN. 30, 1906.

J. BURRY. TELEGRAPHY AND TELEGRAPH APPARATUS.

APPLICATION FILED OCT. '7, 189 3. 7 B SHEETSSHEBT B EH3 I l A M S e PATENTED JAN. 30, 1906.

J. BURRY. TELEGRAPHY AND TELEGRAPH APPARATUS APPLIOATION FILED OCT. '7, 1893.

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I J. BURRY. *fTBLEGB AND TELEGRAPH APPARATUS.

* A 1 1 LiuAT,1ox FILED OUT. 1, 1893.

Witnesses PATENTED JAN. 30, 1906.

J. HURRY.

TELEGRAPHY AND TELEGRAPH APPARATUS.

APPLICATION TILED OCT. 7. 1898.

8 SHEBTSSHEET 6.

[Values ses PATENTED JAN. 30, 1906.

- J. BURRY. TELEGRAPHY AND TELEGRAPH APPARATUS.

APPLICATION FILED OUT. '7, 1893.

8 SHEETS-SHEET '1 1 -k A 1T om T E E H S A S T E E H S 8 PATENTEIQD JAN. so, 1906.

J. BURRY. TELEGRAPHY AND TELEGRAPH APPARATUS. APPLICATION 111L111) 001. '7, 1893.

' plurality of magnets in conjunction with the the following specification and the accom- UNITED STATES- JOHN BURRY, OF NEW YORK, Y.,

E. MUNSON, OF NEW YORK, N. Y.

ASSIGNOR OF ONEHALF TO JAMES TELEGRAPHY AND TELEGRAPH APPARATUS.

To all whom it may concern:

Be it known that I, JOHN BURRY, a citizen of the United States, residing at New York, county of New York, and State of New York, have invented certain new and useful Improvements in Telegraphy and Telegraph Apparatus, fully described and represented in panying drawings, forming a part of the same.

The object of the present invention is to provide an im roved telegraph system and apparatus app icable to printing-telegraphs and similar constructions, and especially to provide a system and apparatus by means of which a ty e-writer or other machine controlled by t e selection of one of a number of keys may be operated with certainty and at a a high rate of speed.

Further objects of the invention are to provide an improved telegraph system and apparatus by means of which a type-writer or other keyboard-machine forming the transmitter may be used also as a mechanicallyoperated machine in the usual manner and to combine in a single instrument a transmitter, receiver, and machine capable of mechanical operation.

I attain these objects in accordance with the present invention by the use of mechanism connected to the keys or other operating, members of the receiving instrument so as to actuate the key or other member selected and including a plurality of selectors which de termine the member to be operated in combination with a magnet or series of magnets which or each of which controls the movement or position of a series of selectors according to electric impulses transmitted to the magnet in different combinations corresponding to the member to be selected, so t at a single magnet performs the work of a selectingrlevices.

It is evident that many different arrangements of selecting devices, magnets, and transmitting apparatus for sending the impulses to the magnet or magnets in different combinations may be made embodying the broad invention and that such arrangements are to some'extent a matter of jud ment and will be varied in accordance with t e character of the machine to be operated, the speed desired, and the number of keys or other Specification of Letters Patent. I

Application filed October 7 1893- Berial No. 487,489-

Patented. Jan. so, 1906,,

members from which selection is to be made. As the invention is designed especially for application to a type-writer telegraph and consists in part of constructions in such an apparatus, the invention will be described with especial reference thereto.

In operating a keyboard type-Writer of ordinary form it is necessary to transmit combinations for at least eighty different characters, and it will be found that for certainty of action and high capacity with this range of combinations it is preferable to use three impulses, two polarities, and two strengths of current, by the different combinations of which elements the selection ma be made in a system employing but a single ine-wire and three magnets, two magnets responding, respectively, to impulses of plus or minus polarity and ordinary stren'gthof current, and a third magnet responding to either plus or minus im ulses of increased stren th.

The se ecting mechanism emp oyed may also be varied widely, and its form and arrangement also will depend somewhat upon the number of combinations and the speed required. A simple arrangement and one which will be found efficient in practice has been selected for illustration, in which a series of movable selecting-bars having openings or alternate elevations and depressions arranged as described in the patent to J. E. Munson, No. 246,411, are used, the movement of these bars preferablybeing a longitudinal sliding movement, the positlon of these se looting-bars by the correspondence or, noncorrespondence of their opening or elevations and'depressions determining the key or other member to be selected, each combination resulting in the movement of the selecting-.

bars, so as to select. a certain key. The selecting-bars are preferably controlled by the magnets throng a series of selectors positioned by the magnets and acting upon the selecting-bars after the positiomn o eration, this construction enabling a ii l i capacity to be secured by constructing t e apparatus so that the positioning operation of the magnets upon the selectors may proceed simultaneously with the selection of the key to be actuated by the selecting-bars and its impression movement. The selectors are preferably mounted on a selectorcarrier, so as to be moved past the magnets in order that the selectors may be acted on successively according to the impulses sent tothe magnets, and it has been found referable to use as the carrier a rotating se ector-wheel, during the rotation of which the selectors are positioned and the selecting-bars v actuated, the selectors being returned to normal position at the end of each rotation of the wheel and the operation of the key selected and return of the selecting-bars to normal position taking place during the first part of the next rotation. It will be understood, however, that this feature of simultaneously selecting and operating the key by different portions of the machine is not absolutely essential. It is preferably used, however, as it enables a high capacity to be secured without decreasing the time allowed for the action of the transmitter and magnets, and thus aids in securing synchronism of movement between the transmitter and receiver. The transmitter and connections for sending impulses to the selecting-magnets in the roper combinations may be of any suitable orm which can readily be varied by those skilled in the art. In the s stem now being described, however, in which currents of different polarities are used, two sunflowers are preferabl employed for distributingthe impulses, t ree segments being, used for the three impulses, the impulses through which are controlled from the keyboard by suitable circuit closing devices, and varying thestrength of the current b control of resistances, in accordance wit the combination corresponding to the key actuated, and the receiver-circuits are controlled by a polarized relay in the line responding to plus or minus currents of ordinary strength and a relay responding only to currents of increased strength, and impulses are thus transmitted to the three corresponding magnets.

The construction and arrangement of both the transmitter and receiver will vary with the class of machines used. Thus in some machines, such as the Caligraph ty e-writer and type-setting machines, no shi t for u Eer case and figures is used, while in t e emington and many other type-writers the paper or type is shifted, either one or two shifts being used. In case a shift or shifts are used the may readily be provided for by using one or more shifting-magnets on the receiverlocal circuit and controlling these shiftin magnets by a shifting key at the transmltter, which may be similar .to those in common use. In such a system it will probably be found convenient to use the. combinations having a first impulse of one strength for the lowercase letters and the samecombinations, but commencing with plus' and minus impulses of the other strength,'- for the capitals and the figures, punctuation, &c., so that the shifting key simply changes'ithe resistance when shifted in one direction, and when shifted in the other direction changes the resistance and actuates a pole-changer, so as to change the first impulse to the opposite olarity from that normally used on the f ist impulse for the lower case. In the system selected for illustration the combinations having a first plus impulse of ordinary stren th are used for the lower-case letters and t e same combinations with the first impulse of increased strength for the capitals, and with the first impulse of increased strength and opposite polarity for the figures, leaving a series of combinations, commencing with a minus impulse of ordinary strength, for extrassuch as the space-key, carriagereturn, 850. The carriage of the type-writer may be returned by the receiving operator; but it is preferable to return this automatically, and this result is preferably secured by attaching a returning-cord to the carriage and securing this to a rotating member upon which the cord is wound in returning the carriage and from which it is unwound during the feeding movement in printing a. line, this rotating member being controlled by a combination assigned to it and selected and actuated as in the case of the impression-keys.

As above stated, the transmitter and receiver are preferably combined in a single machine and so arranged that the receiving portion of each machine coacts with the transmitting portion of the same machine, and the message sent is thus transmitted electrically alsoto the receiving portion at the transmitting-station, thus giving a check not only upon the accuracy of the operator in transmitting the message, but also upon the action of the apparatus in transmitting the message. As above stated, also, this machine is also preferably capable of operating mechanically in addition to its use as a part of the telegraphic apparatus.

In the preferred system and construction the transmitter is not in circuit with the receiver in the same machine or at the receiving-station except when the transmitter is operated; but means are provided by which upon the transmitter being actuated it is automaticall and mechanically thrown into circuit wit both receivers. mitter at the receiving-station is not in circuit with the receiver while a message is being received. Any suitable means may be used for securing the use of the machine mechanically without interfering with the connections by which it is used as a transmitter. A simple and convenient method, however, in the case of a type-writer or other keyboardmachine is to use two keyboards, one set of keys operating the machine directly and the other through electrical connections.

The invention includes also various features in the construction and arrangement of the apparatus by which certainty of operation and speed are secured and various combinations of parts which may be used in Thus the trans-.

- other systems and a paratus and are claimed broadly, all of whic will be fully described liams type-writer, this type-writer being herein and specifically pointed out in the claims. I

As a full understandin of the invention can best be given by an i ustration and detailed description of a system and apparatus embod ing the invention, the invention has been t us illustrated in the accompanying drawin s, forming a part of this specification, which s ow the invention embodied in a'convenient. construction as applied to a t pewriter of common form known as the ilselected as well adapted for illustrating the various features of t e invention.

In the drawings, Figure 1 is aside elevation of the complete transmitter and receiver. Fig.2 is a vertical section taken through the type-writer and keyboards. Fig. 3 is a horizontal section taken below the typewriter. Fig. 4 is a vertical section on the line 4 of Fig. 3. Fig. 5 is a vertical section on the line 5 of Fig. 4 looking to the left. Fi 6 is a vertical section taken centrally througdi the motor-shaft and, showing the selector wheel and magnets in elevation. Fig. 7 is a section on the line 7 of Fig. 6. Fig. 8 1s a section on the line 8 of Fig. 7. Fig. 9 is a section on the line 9 of Fig. 6. Fig. 10 is a reversed plan of the end of the stopping-lever shown in Fig. 9. Fig. 11 shows the cam for operating the impression'mechanism. Fig. 12 is a section on the line 12 of Fig. 6.- Fig. 13 is a plan view of the switch shown in Fig. 12. Fig. 14 is a section on the line 14 of Fig. 6. Fig. 15 is a cross-section on the line 15 of Fig. 3. Fig. 16 shows the sunflowers, the section being taken on the line 16 of Fig. 6. Fig. 17 is a section through the selecting devices on the line 17 of Figs. 6 and 18. Fig. 18 is a plan view of the selector-wheel and selecting-bars at one side of the machine. Figs. 19 and 20 are views, respectively, on the lines 19 20 of Fig. 18. Fig. 21 is a detail of the different selectors. Fig. 22 is a detail of a portion of some of the selecting-bars. Fig. 23 is a side view of the transmitter-keyboard onthe opposite sidefromFig. 1. Fig. 24 is a detail cross-section of a portion of the transmitter-keyboard. Fig. 25 is a detail hereinafter referred to. Fig. 26 is a diagram of the electrical connections. Fig. 27 is a similar diagram showing a modification of the transmitter. I

A brief description of the electrical connections will first be given in order that the functions of the diflerent parts of the mechanical construction may be more readily understood in connection -with the detailed description thereof, and then the electrical, in connection with the mechanical, features will be fully described in connection with the operation of the apparatus.

The transmitting portion of the machine (shown at the left in the diagram, Fig. 26) consists, essentially, of the two rotating sunflowers A B and corres onding trailers a 6, each sunflower havin t ee segments 12. 3,

.connected, respective y, by pairs of wires 11 same manner as the other contact-plates, so

that for the second and third impulses either one or two plates may be actuated by the keys, according as the impulse is to be weak or strong, these contact-plates zz: :0 making contact when actuated with the contacts a, connected to the other contact-plate for the same segment. The resistance 1" for the first segment and impulse is shunted only on the operation of the shift-key, as in the system and machine shown the combinations com mencing with impulses of more than normal 9 strength are assigned to the capltals and the figures, and this resistance is thrown out by the shift-key G, which carries a contactplate at, which makes contact with either of' two contacts 0 0, according as the first impulse is of plus or minus polarity and cuts. out the resistance 1", a pole-changer e being actuated by the shift-key when shifted for printin figures and engaging contact-plates f g, ma 'ng contact with contacts 0 c 0 so as to shift the contacts and change the polarity of the first impulse to minus. The sunflowers A B have also a short segment 4 after segment 3, not in circuit, this segment giving time for the mechanical action of the machine after the last impulse is transmitted, and the segments 1 2 3 are referably made of increasing length, as usuai: to aid in securing s nchronism. The sunflower A is pro- 'vide also with grounds (1 between segments 1 and 2 and segments 2 and 3, as will be fully described hereinafter. The trailer a is connected to the line-wire L and the trailer I) to the wire L, which is connected to round and serves as a return. The transmitter is normally shortcircuited, as the wires L L are connected by a switch h, making contact with a contact 0 connected to wire L. This switch h is the main switch and is automatically operated by the transmitter to break contact with c and throw the transmitter and receiver into circuit. The circuit is controlled also by the contact of switch h with a second contact 0, and this contact is automatically opened to break the circuit and cal circuit through wire 19.

prevent re eating. In the receiving portion of the mac iine the line-wire L connects with the relay R, constructed to beenerglzed only by a current of more than ordlnary strength and from the relay R passes to the polarlze relay PR, the armature i of which closes contact with either contact a or according to the polarity of the :urrent, and is normally central between the two contacts, thus closing the local circuit from local battery LB and wire 14,' connected to the armature '5,

through wire and selecting-magnet M or wire 16 and selecting-magnet M according to the'polarity, and independently of the polarity through wire 17 and magnet M, whlch is the magnet by which the machine is started in motion, and the circuit being coinpleted through wire 18 and rotary cut-out C to ground, a shunt p and contact 0 being provided for automaticallly throwing out the starting-magnet M after the machine is in operation. If one of the resistances 1" r 1" be shunted so as to send an impulse of increased strength to line, the relay R will be energized and by its armature It will close contact with contact 0 and throw magnet M into the 10- Two shiftingmagnets SM SM are used in the receiver, these magnets being on a short circuit 20, normally broken and closed through either of the magnets, according to the movement of the shift-key and combination formed by contact-pieces Z Z closing contact with con- I tacts 0 0 Referring now to the mechanical features of the apparatus, the invention is illustrated as embodied in a machine combining in itself a transmitter and receiver, so that themessage transmitted by the transmitting portion of the machine is recorded at the same station by the receiver portion of the machine, and the transmitting operator may check the message by sight as sent. The machine shown, moreover, is adapted for use as an ordinary type-writer, being provided with two keyboards, by the operation of one of which a message is transmitted electrically and recorded upon the type-writer at the trans rnitting-station and those in circuit therewith at the receiving station or stations and by the operation of the other of ,which keyboards the type-writer is operated simply as a mechanical type-writer in the ordinary manner. The receiving portion of the machine, however, is in electrical connection" with the transmitting portion of a similar machine at another station or stations, so that it operates as a receiving instrument not only for the transmitter at its own station, but also for distant transmitters. As illustrated, their re, a single machine combines a typewriter and transmitter anda receiver operated by the transmitter at its own station or at distant stations, and this machine adds-7 and its operation will be first described in detail.

In the machine shown, D is a type-writer of a form now in common use and .known as the Williams t pe-writer, having typebars 21, actuated rom the keys F, and the paper-carriage E, having the usual sprin step-by-step feeding movement and pivote on shaft 22, so as to be rocked in either direction from its-normal osition by the shift-key F, through link 23, fbr printing capitals and figures, and having the usual keyboard formed by finger-pieces on the keys F. As

all these parts are of the usual construction,

no further description thereof is necessary, the operation being well understood. The objects to be attained in connection with the type-writer D are, first, to provide means by which any one of the keys F may be operated telegraphically from a keyboard-transmitter; second, to rovide means by which the platen may be s ifted from thetransmitter for printing capitals and figures, and, third, preferably to rovide means by which the papercarriage may be returned from the transmitter at the end of a line and the paper fed for line-spacing, although the carriage may be returned and the paper fed for line-spacing by the receiving operator, if a wholly automatic machine be not desired. The transmitter will first be described and then the selecting devices at the receiver by which the keys are selected and actuated. In the machine shown a second keyboard G is mounted in front of the ordinary keyboard F of the machine; but it may be mounted at the side or in any other convenient position so that either keyboard may be used at will. The keys G of the transmitter are shown as vertically-silding bars returned by coiled springs 24 thereon, the lower ends of the keys engaging cam-arms 25, carried by bars 26, sliding longitudinally of the machine, each of these bars 26 carrying on its under side studs or projections 5, varying in number and position and engaging plates 27, extending transversely across and below the series of bars 26, these plates 27 being carried by small rockshafts 28, mounted in the side frames of the transmitter-keyboard and carrying outside the frame the series of contact-plates a b a? b a 6 previously described in connection with Fig. 26, the contacts 0 being shown as pins mounted on the frame in position to coact with the contact-plates. The rock-shafts 28 are held in normal position to close the 'contacts, as shown in Fig. 26, and returned to normal position-when actuated by the coiled springs 29, and the sliding bars 26 are returned by fiat springs 30 pressing against their ends. It will be understood, however, that any other suitable construction and arrangement IIO returning the parts to normal position may be employed.

The sunflowers A B, previously described, are mounted concentrically one inside the other about a shaft H, which carries the trailers a I), this arrangement being preferred for simplicity of construction, although it will be understood that the sunflowers may be arran ed otherwise and may rotate while the trai ers are stationary, if preferred, connection between the contacts a and the segments of the sunflowers being made by the wires 11 12 13, previously described, and through the contact-pieces m n, the former series of contacts m bein mounted on an insulatingblock X, whic carries the resistances 1" r W, previously described, these two series of contact-plates and the removable block X carrying one set and the resistances being used for convenience in breaking the connections without disturbing materially the wiring. In Fig. 3 the block is shown Withdrawn from its place in the machine for clearness of illustration. The sunflowers A B are carried by an insulating-block 32, secured to a standard 33, sup orting the shaft H.

he trailers 11 b are mounted upon the shaft I as follows: The trailer a is carried and insulated from the'shaft by insulating-block 34 and connected by contact-piece 0 and wire L to a contact'piece c, which normally closes contact with switch 72-, and through this switch to line by wire L, while the trailer I) has a metallic connection with the shaft, and thus through the frame of the machine to ground, a contact-bar a: being also in electrical connection with the frame of the machine and carrying contact 0 Thus the connection between trailer b and contact 0, which is indicated by the wire L of the diagram. It will be understood, however, that the trailer may be insulated from the shaft I and connection be made from the trailer by wire to bar as and thence to ground throug the frame of the machine or otherwise.

As above stated, the transmitter is normally shunted by the closing of contact between the switch h and the contact 0, this contact being opened so as to close circuit through the receiver on the operation of an key. To secure this result, the switch h is pivoted on the frame of the machine and is provided at its inner end with an insulated portion 35, which is engaged by a lever 36, pivoted at 37 and having its upwardly-extending arm engaged by a in 39, carried by a bar 40, correspondin to t 'e bars 26, as previously described, an mounted to slide and return in the same manner,- this bar, however, being actuated by each key, so that on the depression of any key the switch it is moved from the position shown in Fig. 13 against the tension of spring 31, so as to open the contact 0 and close the circuit through the magnet M and other parts of the receiver, the switch being returned b the spring 31 when the key is released. he operation of the bar 40 by each of the keys is secured by providing each of the plates 27, in addition to the lip by which it engages the projections 5 on the other bars 26, with a short lip 38 at one end, which en ages a projection on bar 40. As above stated, this switch it also makes contact with the contact 0, which is normally closed and the opening of which breaks the circuit, and the switch h is provided with an arm 41, engaged by a trip 42 on a disk 43, carried by shaft H, so that in case a ke held depressed too long the repetition o the character will be prevented by the breaking of the circuit by trip 42 as the shaft H completes a rotation. The circuit will then be held broken as long as the key is depressed and the switch shifted; but upon the release of the key and the return of the switch to engage contact 0 the switch is thrown off trip 42 and again engages contact a.

The shaft H is actuated and controlled as follows: The main driving-shaft I, shown as a power-shaft driven b the pulley 44, is connected to the shaft H the common cone form, aving the two members 45 46, and the shaft H is normally held stationary against the frictionof the clutch by a stop --arm 47, carried by the driven clutch member 45 on the shaft H and engaging a stop 48, carried by a lever 49, which Is normally held by a spring 50 in position for the en agement of the sto -arm 47 with stop 48 and at its op osite end carries the armature 51 of clutch-magnet M. By this construction when the magnet M is energized by the depression of a key and the transmittal of an im ulse. through segments 1 of the sunflowers B, withwhich the trailers a b are normally in contact, the lever 49 is rocked to raise the stop 48 and release the shaft H, which is then rotated by the clutch 46. On the completion of a rotation of the shaft the stops 47' 48 again en age and the shaft is stopped, one rotation o the shaft in the-construction shown resulting in the transmittal of a comlete combination, the selection of one of the keys F of the ty e-writer D for the impression movement, an as will be full. described hereinafter, the operation of the ey selected on the previous rotation. A cam-piece 52 is also mounted on the armature-lever 49., this cam-piece engaging the stop-arm 47 and movingthe inner member 45 of the clutch slightly longitudinally of the shaft against the coiled spring 53 as the shaft reaches its normal position and holding it in this position while the shaft is stopped, so as to" diminish the friction and wear upon the two members of the clutch while the shaft-H is stationary. The inner clutch member 45 carries also a pin 54, which engages a springarm 55 when the shaft H is in its normal poa friction-clutch of ICO sition, and thus presses outward the contactspring p and breaks contact between this spring and contact c, thus throwing the magnet M into circuit. When the shaft H is started and the pin passes out of engagement with arm 55, the contact is again osed and the magnet M cut out of circuit, so that this magnet is energized .only on the first im ulse an for the purpose of starting the sha H. The release of the armature 51 for the return of the stop 48 into position to .enga e the stop-arm 47 and stop the shaft H at t e end of a rotation is assured, and the repeated opvented. v

The parts thus far described are those which perform the functions of the transmitter; but it will be seen that the shaft H also acts when the machine is 0 erating as a receiver andthat the ma et Lfand the devices by. which the shaft is controlled also form a part of the receiver, as 'well as of the transmitter. The parts'to be now described perform no functi'onin the transmitting operation, but belong solely to the receiving portion of the machine.

The shaft H also carries splined pn a sleeve forming part of the inner member of the clutch a rotary cam-disk K, having'a closed cam which engages a stud 56 on onearm of a horizontal lever N, pivoted at 57 to a plate 58, adjustably secured to the bed-plate of the machine, so as to be adjustable to secure the exact movement required, this lever N being connected by a link 59 to a bar or late 60,

pivoted at 161, so as to swing longitudinally of the machine, this bar actuating the selected key F through the connections to be described. By placing the cam-disk K upon the sleeve connected to the inner member of the clutch, this sleeve being splined to slide upon the shaft, and connecting the cam to the bar 60 in such a manner that the pull upon' the bar 60 tends to force the cam K and the inner portion 45 of the clutch to which it is connected against the outer portion 46 the pressure upon the clutching-surfaces, and consequently the friction between the two members, increases with the ull upon the bar 60, so that the action of this ar is assured, even under varying degrees of resistance of thekeys due to excess of friction or wear, while at the same time the clutching-surfaces will slip in case of any absolute block in the movement of the parts before breakage will occur. The shaft H also carries the rota cut-out C, which, as shown, consists of a b ock of metal or other conduct in material having electrical connection with shaft H and thence to ground and carrying conducting-pins 6, which enga e a contact-piece 9, this cut-out closing the ocal circuit only when one of the pins 6 engages the contact-pieceg, with which connects the eration of the lever 49 at each impulse is pre- H extending transversely to the mac e andwire 18, as shown in Fig. 26-. The pins 6 are preferably made adjustable, so as to secure the closing of the circuit at just the time desired and to enable the time of closing to be adjlusted to aid in securing synchrom'sm, as ful y described hereinafter, and in the construction shown the disk forming the contact C is provided with a series of holes, into any one of which the pins 6 may be inserted.

The devices for selecting the key by the combinations of .impulses transmitted will now be described.

The shaft H carries outside the standard 33 a selector wheel O, which in the form shown consists of two disks secured together by tierods 61. Mounted to slide in the selectorwheel so as to be positioned according to the different combinations are a series of selectors, each consisting oia rod,by which the selector is mounted in the disks of selector wheel 0,- and an arm on the rod, which forms the operating part of the selector, coacting with the selecting-bars above referred to. In the construction shown eight selectors are used, and for conveninece they are numbered in series s s 8 8 s s s s". The rods by which the selectors are mounted to slide in. the selector-wheel are arranged upon three different circles, the selectors s s .9 being upon the inner circle, selectors s s u on the outer circle, and selectors s s .9" upon t e middle circle, and the arms on the selectors are of different forms and lengths accordin to their osition, so as to brin the ends of al the seectors in the same p ane outside the wheel and in position to engage the selector-bars -u' on each rotation ofthe selector-wheel O. T ese selectors are actuated during the rotation of the selector-wheel O by controllers m m m and the three magnetsM M M corresponding to the three series of selectors on the different circles, these controllers consisting in the form shown of sliding bars, mounted in brackets 62 on the base-plate, pressed by springs 63, so as to be normally withdrawn from the paths of the selectors and carried by the armatures 64 of the magnets M M M which armatures are on arms 65, pivoted on the vertical bracket 66 so as to swing toward and from the selecting-wheel, so that the controllers are carried in one direction by theaction of the magnets on the armatures 64 when the 'magnets are energized and on the release of the armatures are returned by the springs 63. These controllers m 'm m lie, respectively, op osite the path of movement of the three circ es of selectors above described, so that when advanced toward the selectorwheel they will extend into the paths of the latter and have their ends next the selectorwheel 0 formed with surfaces inclined in the line of movement of the selector-wheel, and the ends of the sliding rods forming part of the selectors pro'ect outside the wheel, so as to engage the inc ined surfaces of the rods m m 'm when the latter are brought into the paths of the rods, and by the cam action of the inclined surfaces press the selectors toward the opposite side of the wheel, so as to change their position relatively to the other selecting devices and in certain combinations for the selection of the key to be actuated. Upon the vertical bracket 33 on the opposite side of the selector-wheel 0 from the magnets are stationary cam-plates 67, mounted concentrically, a plate for each series of selectors, so that as the selector-wheel com letes its rotation the selectors are returne to their normal position, so as to be again engaged and actuated by the inclined ends of the controllers m m m on the next rotation of the selector-wheel. The selector-rods, as will be seen from the drawings, are arran ed at the proper oints on their respective circles'to be actuated in succession b their res ective controllers m m m accor ing as the atter are advanced into position to engage the successive selectorrods, this depending upon the number of imulses transmitted to the magnets M M? M om the transmitter through the sunflowers A B. The sections of the controller-wheel carrying the selectors, therefore, correspond to the sections of the sunflowers traversed by the rotating trailers a b, and it will be seen that synchronism of movement within certain limits must be maintained between the shafts carrying the trailers at the transmitting-station and the shaft carrying the selector-wheel at the receiving-station in order that the impulse transmitted through the first, second, or third segment of the sunflowers may energize the magnet at the proper time in the movement of the selectorwheel to position the corresponding controllers m m m to act upon the proper selector. The eight selectors correspond to and are controlled by the first, second, and third impulses of their res ective magnets, except that magnet M w 'ch controls the outer circle of rods and responds to a minus impulse of ordinary strength, controls but two selectors, which correspond, respectively, to

. the second and third impulses, this magnet controlling no selector on the first impulse, as will be hereinafter more fully explained.

Arranged opposite the selector-wheel O with their ends in osition to be engaged by the selectors on the rotation of the wheel when the osition of the selectors is shifted, as above escribed, by the magnets is a series of selecting-bars sliding transversely to' the machine, these bars consisting in the form shown of thin metal plates set edgewise vertically and provided with notches 7 on their upper edges, these notches being arranged differently in the different plates; Nine of these plates are usedeight plates (lettered, respectively, t t t t t" t t corresponding to the res ective selectors s s s s s s s" 8 by which t ey are respectively actu- 1 cranks will by the selectors a short distance:

ated, and a ninth late t, the function of which will be descri ed hereinafter. Upon these plates rest the front ends .of a ser1es of links u, provided at their outer ends with shoulders 68, forming hooks engaged by the bar in the lower osition of the hnk, the links being normally eld raised, so as not to be engaged by the bar 60 in its movement by. the raised ortions of the selecting-plates, as shown in ig. 2. When, however, the selectingplates are so positioned that the notches 1n the plates register so as to form a notch extending clear across the series of plates, the link u corresponding to such notch will be allowed to drop into the os1t1on shown in Fig. 4, so as to be actuate by the bar 60. Thefirst' three links, which to distinguish them will be lettered 'u/ 'u, u", are reserved, respectively, for the carriage-return and the two shifts; but each of the other links corresponds to and actuates one of the keys -F, these links being pivoted at their rear ends to bell-crank levers 79, which are springpressed to normally hold the link u in their rearmost position by springs 80,- the normal position of the bell-cranks 79 being adjustable by sto -screws 81, so that these bellbe held in proper adjusted position. for the re uired action of the typear The rear end 0 each of the bell-cranks 79 engages a lever 82, pivoted to a frame 83, suspended by pivoted links 84 at the op osite side of the machine, so as to be adjusta le to secure the ro er position of the bank of levers 82. acl i of these levers 82 is connected by a connecting-rod 71, preferably adj ustable, as shown, to one of the levers F, this completing the connection between the bank of links u and the key-levers F.

As above stated and as will be seen from the drawings, the selecting-plates are pushed in one direction or to the right in Figs. 3, 17, and 18 b the selectors s, &c., as the select- -whee O rotates, and a continuous notch being thus formed the link drops in and is then actuated by bar 60. As the bar 60 draws the link u outward it raises it at the same time, as will be seen from the drawings and thus releases theselecting-plates, which are then returned to normal position before the link u returns. To thus return the selecting plates, a vertical return bar 72 is used, extending across the series of selectingplates adjacent to the selecting-wheel and entering a notch 73 in the lower edges of the 1plates, this bar being pivoted to the baseame and normall held by s ring 74 in the osition shown in 17 in w ich the selectlng-plates are free to be moved longitudinally The return-barv 72 is provided with an arm 75, which is engaged by a stud 76 on the selectorwheel 0, this stud being shown as a screw, so as to be readily adjusted, and the return-bar 72 thus actuated at the proper time and carturn the selecting-plates to normal position,

' the movement of the return-bar under the pressure of spring 7 4 being limited by a stop 77, engaging the arm 75, and the movement of the selecting-plates in both directions is limited by a fixed stop-plate 78, set into a slot in the upper edges of the plates.

As above stated, there are nine selectingplates, but eight of which are engaged by the selectors. Of these eight selecting-plates engaged by the selectors two (lettered, respectively, t t and corresponding, respectively, to selectors s s") are short plates and, as shown clearly in Figs. 18, 22, extend under and control only the two links 11, u for the two shifts, these two selecting-plates being actuated, respectively, by the first impulse of the magnets M M, which corresponds, respectively, to currents of plus polarity and increased strength, M actuating no selecting-bar on the first impulse, as above stated. Each of the selecting-plates t t is provided with a slot 8, through which passes a pin 9, carried by the extra plate t, which may be termed the universal plate, this plate being actuated by either of the plates t t in its movement. The notches upon this plate t are so arranged that when it is moved, which is upon the formation of every combination commencing with an impulse of plus polarity or an. impulse of increased strength of either polarity, it cuts out one series of combinations-namely, that commencing with an impulse of minus polarity and'ordinary strengthand throws in all other combinations. tionary, therefore, the combinations com- Inencing with a minus impulse of ordinary strength may be formed and therefore it is unnecessary to actuate this plate for such combinations, so that the minus magnet M actuates no selecting-plate on the first impulse. Of the other selecting-plates t t t correspond to the second impulse and the corresponding selectors, and plates i t i .to the third impulse and corresponding selectors. The action of the plates on the different impulses will be understood from the following table:

Character of impulse. Magnet energized .M'

'zi; 3 M 1V1 1H 1VI M Selecting-Plates Actuated.

1st impulse. .t' if none t t t t t 2d impulse ..t t t t t t 3d impulse t I) t t t t When this plate is sta tinuous notch in the series of selecting-plates is formed opposite the link '11. connected to said key-lever, into which the link '11, drops, so that on the movement of the bar the keylever F thus selected is actuated by thebar engaging the shoulder 68 of the link corresponding thereto.

As above stated, the links 11, 'u, are not connected to keys, but are used for shifting the carriage forward or backward for printing capitals or figures when the shifting combi nations are formed. The combinations assigned to the capitals are those having a first impulse of lus polarity and increased strength and tl iose for figures ofminus polarity and increased strength. These combinations, therefore, all result in moving the selectorplate t and the combinations for capitals in moving also the selector-plate t.

From an examination of Figs. 18, 22 it will be seen that the movement of both the short plates t t brings notches in these plates into line opposite the link 1L and that the plate t has a notch normally opposite the link 11?, and the movement of the plate 25 brings a notch in that plate opposite the link 10 so that these two links u *w' are controlled by these two plates, the other plates being cut out opposite these links, so that their position has no effect upon them. As the move ment of the plate t is produced only by a first impulse transmitted to magri'et 1\/I -that is, a first impulse of increased strengthit will be seen that the two short plates t t are never positioned so that the links a u can drop except when combinations commencing with a plus or minus impulse of increased strength are made, the selection of the link a 11, depending upon whether the plate t is actuated, together with plate F, or notthat ICC is, whether the first impulse is transmitted to the plus magnet M or to the minus magnet M in the former case the plate t being actuated together with plate t and in the latter case the minus magnet M actuating no plate on the first impulse, as previously described. It will be understood that the continuous notch for links a 11, being formed on the first impulse in accordance with the polarity of said impulse, the combination completed by the second and third impulses, or in the case of one character the shifting ofthe plate t on the first impulse, the second and third not be-v ing employed, results in the formation of another continuous notch for one of the links 11., connected to a key-lever F, so that for capitals and figures the bar 60 when actuated actuates one of the links 11, a for shifting the carriage and also one of the links u for the impression of the desired character.

The links "a "u? are connected to swinging arms 79, pivoted on the same line as bellcrank levers 79 and returned b springs 80 in the same manner as these bel -crank levers;

butthe upper arm of the bell-crank is not required, as no typelever is actuated. The

swinging levers 79 are simply supports for the in Fig. 4, so that immediately upon the first impulse and the dropping of one ofthe links u u the contact is formed between the contactpiece I or Z and the contact-spring c or c, accordingto thelink, and this contact is maintained during the forward movement and return of the link, thus insuring the proper shifting of the carriage before the impression :during the impression. 5

. is made and its being held in proper position The contact-pieces Z or Z, corresponding to the links it u, close contact through wires 20 and local battery LB with shifting-magnets SM or SM, according as the carriage is to-be shifted for ca itals or figures. These shiftin -magnets shi t the carriage b means of cran -arms 85 on rockshaft .22, y which the carriage is pivoted, these crank-arms 85 carrying the armatures 86 of the magnets and the levers being so arran ed, as shown clearly in Figs. 4 and 5, as to shi the carriage in opposite directions.

The shift-key G on the transmitter is mounted on the side of the keyboard in the same position as on the ty e-writing machine and by its movement f r" capitals simslide in brackets on the keyboard-frame and 40 having two arms engaging the contact-pieces 1 f g, 'shifts the contact-spring f from contact 0 to contact 0 and contact-spring g from contact c to contactc, so as to make the first impulse of minus polarity. The shift-key G is returned to position by springs 83 of common form, embracing a crank-arm on the shift-key.

The carria e may be returned at the end of the line by t e receiving operator; but it is preferable that the machine be made entirely automatic, and for this urpose there is shown means for automatica ly returning the carriage controlled from the transmitter, the link 41/ eing used for this purpose and a certain combination assigned to it, for which may be used any of the combinations commencing with the minus impulse of ordinary strength,-

the two shortselectinglates t t bein provided with notches whic in the norma osition of-these plates register with the lin u,

- so that alnotch'may be formed for this link without actuatin either of these plates, this' link being selecter therefore, by the combination of second and thirdfimpulses With'a first minus, impulse of ordinary strength. The

ply closes contact between contact-piece wprinciple used 'in the area-tam is that of a rotating memberbywhich'is wound up for.

the return of-the carriage a cord connected to the latter, this cord being unwound from-the 17o rotating member duringthe feeding'move-' ment; The following is the constructions shown: Upon the constantly-rotating shaft, I, from which the shaft H is actuated, as re-' viously described, is splined a disk-87, w ich forms one member of a clutch, the other member 88, being normally pressedaway from it by a spring 89 and carrying a sleeve'90, upon, which the cord connected tothe carriage is wound, this cord '0 being connected tothe carriage at one end,- running over pulleys 91, and at its opposite end to' the sleeve 90 through eye 92. The clutch member 87, isthrown into clutching contact with the other clutch member 88 for the return of1the carriage by a cam w, carried by a leverf93, ivoted on the frame and engaged by a sli ing throw-off 94, which carries the eye 92 and is provided with a notch 95'on oneside, entered y the lever 93, so asto actuate the latter has a slot connection providing for lost mo tion, with alink 96 connected to one arm of a bell-crank lever 97, pivoted on the-base-plate of the frame and having its other arm'con nected' by a link '98 'to the link u and the cord 42 carries a trip y, which maybe a knot or any suitable projection to catch in the eye 92,- preferably a collar adjustable on the cord, as shown. By this construction when-the carr'iage is to be'returned the actuationof the key on the transmitter producing the combination assigned to the link 11/ this link is actuated ,thereby shifting the throw-off 94 through link 96, lever 97, and link98, so as to; throw the lever 93 inward from the position shown in Figs. 7 and 8, so that the cam w, acting on the rim of the sleeve '90, forces the clutch? member88 into contact with member 87 and holds it there, so that sleeve 90 is rotated by the shaft I and the cord '2; wound up for the return of the carriage. The link '11, and lever 97 are returned almost immediately, this be-" ing permitted without movement of the throw-off 94 and lever 93 by the lost-motion connection a, and the throw-oft"- is shifted to throw the lever outward and release the The operation of the apparatus will now be described. The machine shown,-as'above explainedj-fornis the complete apparatus at e transmit:

each station embodying inone t ting andreceiving instruments, it being understood that a similar machine is'located at each one of the-stations, the twoshafts Hof the machines at the transmitting and receiving stations rotating in unison, so that-the" trailers ab of the machine at the transmit- -clutch when the carriage is fully returnedby the engagement of the stop y with the'eye 92.

ting-station and the selecting-wheel O of the machine at the receiving -station move in synchronism within the limits of the, segments of the two wheels,in order that the selector-rods controlledby the different magnets may be shifted into'position to engage the selecting-bars or left in normal position, so as not to engage them, according as an impulse is transmitted through the se cuts of the sunflowers corresponding to t e segments of the selector-wheel in which the selector-rods are placed.

The operation of the apparatus will first be described in detail, assumin that complete .machines are placed at both 51c transmitting and receiving stations, and then a brief description given of the construction and arrangement in case separate transmitting and receiving instruments are used. It will be understood that the simplest combinations will be applied to the letters most frequently used; but it is thought-unnecessary to explain in detail the arran ement of combinations, as this is Within t e judgment of one skilled in the art. Assuming for the purpose of illustration, however, that the character to be printed is the letter b, lower case, and

that the combination assigned to this letteris :fi:that is, a first impulse of plus polarity and ordinary strength, a second impulse of minus polarity and ordinary strengtlnand a third impulse of plus polarity and increased strengththe operation is as follows The circuits will be traced by reference to the dia gram, Fig. 26, it being understood that the wires shown therein represent any suitable connection, and the term .wire is thus used. The key G of the machine at the transmittingstation being de ressed by its action on camiece 25 on the ar 26, corresponding to said ey, slides the bar rearward, and by its arrangement of projections 5, acting on the plates 27, carried by rock-shafts 28, which carry the contact-pieces, rocks the shafts required to shift the contactpieces a, b, and a, from the contacts 0, with which they make contact, as shown in Fig. 26, to the contacts connected with the other wire of the battery MB and to shift the outside contact-piece a into contact with the contactiece 0, thus shunting the resistance r e movement of the key also through lip 38 actuates bar 40, carrying pin 39,and this pin engages the upper arm on the lever 36 and carries the lower arm into position to shift the switch h, so as to break contact with the contact 0', thus breaking the shunt-circuit in which the transmitter is placed normally and throwing the transmitter on to line, as will be clear from the diagram, Fig. 26. The trailers a b are now in contact with the first segments of the sunflowers A B, and an impulse is now transmitted through contact-piece a, .wire 11 resistance r, contact-piece f, and contact 0 to the segment 1 of sunflower A, trailer a in contact therewith, and line L to the receiving portion of the machines at the transmitt' and receiving stations, and back throug ound line trailer 1), segment 1 of sunower B, wire 11, contact a, and contactpiece 9 to contactiece b and contact 0, andv thus to battery. his -impulse energizes the polarized relays PR at the transmitting and receiving stations, so as to close contact between contact-piece 1', and contact c,,so that the local circuits from local batteries LB are completed through wire 14, contact-piece '5, contact a, wire 15, magnet M, wire 17, magnet M, wire 18, contact 9, cut out C, and ground, it being understood that the circuit is broken at C except when one of the pins 6, carried by the rotating disk of the cut-out, is in position to make contact with contactpiece g. In the normal position of the parts,

owever, this contact is closed, as is necessary to start the machine. As the magnets M are thus ener 'zed, the'first result produced by this impu se in each machine is to rock the lever 49 by the attraction of the armature 51, and thus raise the stop 48 out of the path of arm 47, carried by the inner clutch member 45 of shaft H, the friction of the clutch then rotating shafts, H of the transmitting and receivin instruments with their respective shafts motion at the same time. The magnet M in each machine being energized by this impulse, the movement of its armature advances the controller m against the tension of s ring 63 into the ath of selectors s, and as t e selector-whee O, carrying the selectors s, &c., passes the controller m the selector s is moved into a plane opposite the selector-plate t, so that on the com letion of the rotation of the selector-wheel t 's selector will engage and move the selector-plate t The two shafts are thus started in 5 thus com leting at each station the movement of t e first impulse of the combination.

As the rotation of the shaft H at the transmittin -station continues the trailers a b are carrie from the first segment of the sunflowers A B onto the second segment, and the circuit through segments 1 is thus broken and magnets M M dener ized the controllers m being then returne by their springs 63. As the magnets M are denergized the armatures 51 are released and the levers 49 are rocked by the springs 50, so as to carry the sto s 48 and cams 52 into position to enage t e stop-arms 47 when the shafts H have .com leted a rotation, and thus stop them and hold them in normal position until the magnets Mare agiain energized by the depression of another ey. The magnets M are not energized on the second and third impulses, but are shunted, except when the parts are in the normal position, the shafts H at the commencement of their rotation moving the pins 54 out of en agement with the arms 55, so as to release t e spring-contact p contact-piece q before the line -circuit is broken, so as to break contact at contactpiece '5, and likewise upon sending the next impulse the contact is first closed between the contact-piece 'L and contact 0 or 0 and then the next pin 6 brought in contact with the contact-piece so that the local circuit is never complete or broken at the contacts 0 0" except upon sending the first impulse. The purpose 0 this construction will be fully explained hereinafter. As the trailers a b come into contact with the segments 2 of the sunflowers A B a second impulse of minus polarity is transmitted through the contact 0, contact-piece b resistance r wire 12, segment 2 of sunflower B, trailer 1), wire L, and ground, returning through the receiver, wire to trailer a, segment 2 of sunflower A, wire -12, contact-piece a, and contact 0 to left of a to battery; B this impulse the olarized relay PR at eacfi station is energize so as to close contact between contact piece 'i and contact c and the circuit through local battery LB is thus closed through wire '14, contact-piece 'i, contact 0 wire 16, magnet M wire 17, contact-piece p, and contact 0 and cut0ut C to ground, when the cut-out C has reached the proper position, thus energizing magnet M The magnet M of each machine when energized on this second impulse advances controller m by its armature-lever a ainst the tensionof spring 63 into the path 0 the selector s ,corresponding to selectorplate i, so that as the selector-wheel continues its rotation and the selector-rod is carried past the beveled end of the controller this selector is moved into position to engage and actuate the selector-plate t. -The circuit through magnet M is now broken by cut-out C and the controller in returned by spring63, and the trailers a b of the transmitter being now carried by the rotation of the shaft H off the second segments of the sunflowers A B the line-circuit is again broken. When the trailersare on their third segments, an impulse of plus polarity of increased strength 1s transmitted from battery MB, through contact c at right of a, contact-piece a segment 3 of sunflower A, trailer a, wire L and the receiving portion of the machines returning through ground, wire L, trailer 1), segment 3 of sunflower B, wire 13, contacts 0: 0 b and contact 0 to left of b to battery, the resistance 1* being shunted by themovement of the contact-piece as, as previously described. By this impulse of increased strength the polarized relay PR at each station is actuated so as to close contact between contact-piece i and contact 0 and close the circuit through local battery LB, as previously described in connection with the first impulse, except that contact is first closed at contact 0 and then the circuit completed b cut-out C, and the relay R is also energize at the same time as relay PR, so as to close contact between the contact-piece k and contact 0", thus throwing magnet M into circuit by wire 19, magnets M and M thus being energized. Thetwo magnets M M at both stations when thus energized on the third impulse advance their res ective controllers m m by'their armatureevers 65, against the tension of the springs 63, into the paths of the rods forming part of the selectors s 8 corresponding to the selecting-plates t t", so that as the selectorwheel continues its rotation and the rods are carried past the beveled ends of the controllers m m these selectors are moved into osition to engage and actuate'the plates, t e local and line circuits being then broken and selectors returned, as described in connection with the second impulse. As the result of these three impulses, therefore, the selectors s s s s have been moved into osition to move the seleCtinglates when t e rotation of the selecting-whee s 0 brings these selectors into position to engage the ends of the plates.

-On.the continued rotation of the selectorwheel 0 and just before the com letion of its rotation this action takes place, t e selectingplate t carrying the selector-plate t with it, and thus selecting plates #23 t, t t are moved longitudinally to the right in Figs. 3'and 18, this movement of the selecting-plates resulting in the'formation of a notch extending clear across the plates under the link a, attached to the key F of the type-writer D, which prints the letter b, lower case, this action taking place in the machine at both stations. The machines may be so constructed that the link selected is actuated for the impression movement during this same rotation of the shaft as that by which it is selected, the shaft H havin a sufficient movement after the selecting-p ates are positioned to secure this result; but it is preferable, especially for a high capacity, to produce the impression during the formation of the combination for the next im ression, so that the selection of the key and the operation of the impression devices proceeds simultaneously and a more rapid r0- tation-of the shaft can be secured or a larger range allowed within which synchronism .membe'r 45-reaches its normal position and nets M are again energized by the actuation in otier'key being .of another letter, t e formation of a space 01' v 50, remove the stop 48 from the of another key. The selection of the ke for the character to be printed has now 11 made and the link u, correspondin to that key, is nowin position to be actuate ,this bethe normal osition of the parts. An-

e ressed for the impression other action of the machine, the magnet M at each station is again ener ized, so as to rock the stop-lever 49 against t e tension of s ring ath 0 arm 47 on the inner member 45, and t e shafts H are again rotated with the shafts I. On the rotation of the shaft H the cam K thereon engaging the bowl 56 of lever N rocks this lever toward the front of the machine in Fig. 3

and throu h the link 59 rocks thd bar 60 to the right om the position shown in Figs. 2 and 4, thus drawing forward with it the link it, which has dropped into the notch in the selecting-plates provided by the combination, as previously described, and thus through bell-crank lever 79, lever 82, and connectin -rod 71 draws down the lever F, correspon ing to the link u, and 'actuates the corres onding t pe-bar 21 to print the letter b, t s lever a so producing the letter-spacing, as in the ordinary type-Writer. From an examination of Fig. 4 it will be seen that the bar 60 as it is rocked to the right not only draws the linku outward with it, but also raises the link, and this lifting of the link is sufficient to carry it above the edges of the notches in the selecting-plates into which it is dro ped, so as to release the selecting-plates an permit them to be returned, which return is at once secured before the return of the bar 60 by stud 76 on the selector rocking the returnbar 72 to the left in Fig. 17'aga1nst the tension of spring 74, this bar after returning the plates being returned to position by the spring. The character having been printed at both the transmitting and receiving stations and the selecting-plates having been returned to position, the bar 60 is returned to the left into the normal position, as shown in Fig. 2, by the cam K acting through lever N and link 59, and these parts are then in position for the impression of another character on the next rotation of the shaft, the operation of positioning the selectors and selectingplates for the next character having proceeded simultaneousl with the impression operation, and thus the operation of the apparatus is repeated for the successive characters tobe printed. When the carriage is to be shifted for the impression of capitals or figures, the shift-key G is moved so as to shunt'the resistance r by the contact-plate at, making contact with one of the contacts 0 c, accordin as the shift is for capitals or figures. In t e latter case, also, the key G at the same time shifts the pole-changer e, so as to change the contacts made by contactplates f g and make the first impulse of minus polarity whether the contact-piece a or b be shifted 'bg key to close contact. The circuits in both s afts will be understood from the description already given, and the only difference in o eration from the same combinations for ower-case letters is that upon the first impulse magnet ltI is always energized in addition to magnet M or hi, thereby positioning the selector 8 to move the selectinglate t. As will be seen from Fig. 22, thereore, the selecting-plate t being moved link 11. or u will be selected and allowed to drop as a result of the first impulse, these two links corresponding, respectively, to capitals and figures and the selection between the two links being determined by the polarity of the impulse. If a plus impulse, magnet M will be energized and selector 8 and selectingplate t actuated so as to move the latter plate with the selecting-plate t thus selecting link 11?, while if the first impulse be of minus polarit plate t will not be moved, but only selecting-plate t and link 'ui selected. By thus selectin link 11. or Us on the first impulse and one 0% the links u on the completion of the combination or on the first impulse by the movement of plate t the bar 60 when actuated draws out not only one of the links u, but also link u or 11. As the link a or U3 dr ops the contact is closed between contact-spring l or Z and contact 0 or 0 thus throwing shifting-magnet SM or SM into 10- cal circuit on wire 20, the energizing of one or the other of these magnets resulting in the shifting of the carriage through armature 86, lever 85, and shaft 22, as reviously described. So long as. the shifting key G is held shifted in either direction at the transmitting-station so long will the resistance 1" be thrown out on the first impulse and the contacts be changed, as above described, so as to result in the selection by the first imulse of one of the links u or u and the shifting of the carriage in one direction or the other. Thus by assi ning the same combination 'to the same etters in capitals and lower case one key serves for both, the shifting key simply increasing the strength of the first impulse so as to energize magnet M in addition-to ma et M or M with the result as above state By the selection and depression of the successive keylevers F of the receiver, as above described, the message is printed as in the ordinary type-writer, the 

